Arbor for pipe casting molds



Feb. 28, 1933. T. G. BUSH, JR 1,899,228

Filed April 13, 1932 2 Sheets-Sheet l Fei. 28, `1933.

'T. GA BUSH.` JR

ARBOR FOR PIPE CASTING HOLDS Filed April 13, 1952 2 ,Sheets-Sheet 2 BWM ,779ML Gttorneg Patented Feb. 2.8,.193143".k

UN TSD.S.2T-TES l Amonon PIPE CASTING. fMoLDs- 'My present ainvention relates [to yimproved arbor for pipe-casting molds or iiasks,l

of the type employed in the manufacture of t pipe and similartubular structures, by the 5. horizontal method.L j

As is well knov'vnto those familiar vvithlthe castingr of 'pipes [by this methodgfit isjimper ative Yandessential ythat the arbor or core-f bar Within the sand-core about vvhichjthe` pipe is cast,shall. be locatedand maintained ,l in true aaialwalinementI With the flask, tor

` insure 'the production of pipes having` Walls of uniform thickness'. The yuniformity 1nf f the thickness of the Walls of the cast pipe, is

desirable and necessary for various reasons, as for instance'to insure cuttingof the piipe, when required, Without danger of'crac or'breaking. v "n y In carrying out my invention, I fashion the 20 Vafrbor,`v nearI its spigot end, with an exterior pad, located at the upper or? cope side ofthe arbor, and approximately semi-oircularin shape.` lith the drag in horizontal position on the floor of the foundry, the core is placed i in position; the cope is superimposed `there-` on'in usual manner; and the semi-circular pad 'of .the 'arboris positioned beyond the `spigotend of the pipe that is cast Withiny the .y moldfin usual manner the-arbor. of course, f -being ofsuch sizeas to permit the arbor to be Withdravvnj and vpass through the pipe` after it has lbeen cas n n By the employment of the improved arbor of my invention, `thenecessity*'foruse of mechanical supports-to prevent the core from sagging out of alinernent is eliminated,fvvhilef onthe other 'hand the core is :accurately cen-f tered in th'efm'old` or flask andimaintained inproper positionfforfthe pouring operations. n 40 v 'plVhen the core is placed inthe drag andthe f cope superimposed'v thereon, the soft sand of the core, permits a slight'orlimitedl degree of settling ofthe core, then,fwhen the `molten i c meta-l is poured,the core is liftedto its proper position, and theremaintained,qto insure proper jalinement and uniform thickness of the Wallsof the castpipe; Y x

j j i c. The invention consists in certainnovellfeac tures of construction in the arbor. or core bar 'and lin certain` combinationsv and arrangeling! vmy invention.

ments lof para in uw 'mold of flask, as will ciples of my inyention', but it-vvill'be`under' d stood that changes rand alterations vmayyb'e f made in the'ex'empliiied structure within the scopeof my claims, without vdeparting from the principles of my. invention. K j c f F igurev l is' anend VieWofa double mold "65 for flaslnof the horizontaltype, involving'tlie arbor: of my 4invention, and.y showing f by ydotted lines one of the ypouring gates orspruetwo cores .of the 'double-mold;

holes and the lateral ducts therefromvto the@ y .i

l Fig. 2is a longitudinal vertical sectional View at line 2 2 of Fig. 1,9vvith the arbor in sideelev'ation,` and broken avvay for convenience of'illustration; A f f j v y Fig; Bjis an enlarged, transverse vertical'f75 sectionalvievv through the usual ,smallyanf nular, exterior pady ofthe arbor,`shoWing vent holes therein; 'f i f f F ig. 4 `is an'enlarged longitudinal vertical sectional view at the spigot end of the with thearbor also in section; and f Fig.5 is a transverse vertical sectional lview mOld 8d of the core through the y.pad portiony of the arbor, fand illustrating the novel features of y *'In' order Ithat the generalarrangemenh' relation, andutility of theparts ymay readilyy be understood, I have illustrated inthe t drawings va Well known horizontal type of -double mold or flask'in which the ydrag is'in` `90 dicatedfas land the cope'a'sQ, the mold orlask being provided With thegusual lendwalls 3 and 4, The molten metal is poured through` they gates or sprue holes 5 (dotted lines Fig.

l) which are spaced along the longitudinal'95 l center "line vof the lhorizontal `mold`, land the vmolten metal hows through the lateral .ducts 6 .and 7 to thetwo cores yof thedouble mold.

y In Figure l, thearbors 8 and 9 larev indicated Q w y forfthe two cores, and inasmuch lasthese ar- '(1:00 i

bors are of duplicate construction, a description of one will suffice for both.

The arbors are constructed as usual of iron, and of course vary in length and diameter in accordance with the size of the pipe to be molded;'and, as indicated in Figure 2, the

pad 13,l and as seen in Figures 2 and 4, 'Iemploy an additional exterior pad v14 onthe arbor which is free of the cast pipe, andlocated between the spigot end of the pipe and the adjoining end of the cope or upper section of the mold. Y

The exterior pad 14V projects from the exteriorface of the arbor` and this pad ma be 4 bulging portion of the arbor and providing lfashioned in suitable manner, as by ad ing Y material or metal to theexterior face of .the

Wall of the arbor, or as indicated inthe drawings, the pad 14 may be formed as an exterior an increased interior bore at this portionjof thearbor. AsindicatedV in Figure, the exteriorV surface of the pad is` approximately semi-circular, j, and the pad occurs at the cope side of the arbor, with the semi-circular. surface terminating in approximatelyvertical lateral faces 15, and inwardly inclinedV faces 16 merging with the lower semi-circular Vface of the arbor, which,.as indicated, isv of less diameter than( the pad surface at this point.v

In making up the core, the soft sandjsurrounding the pad, as at 17, forms afthin layer at the cope side as compared with the thickness of the sand at 18 at the drag side ofthe core, and thus a very thin layer, say one-sixteenth of an inch in thickness, of soft sand, surrounds the the arbor. y

In Figures 2 `sand about the` arbor; is softer and less dense than the cope sand and dragsand,pm order that the casting may be vented entirely through thesand on'tlie arbor andforming p y j v A vterior pad on the arborbetween the y'spigotthe core for the pip-e. Y d, j

-Due to the fact that thesand on the arbor and forming the core for the pipe, is comparatively soft, the core, when placed in the mold, because ofl the combined weight. of the arbor and the core-sand, settles slightly below `the center line of the mold andcompresses the core-sand accordingly at the Vdrag Vside of th-e core.

As the vmolten metal ispouredk into the iall pad at thecope side of' and 4,1the pipe to be cast is j designated as 19, and the usual thickness gates or sprue-holes 5, and flows through the lateral ducts y6 and 7 to the cores, and

the pad `14 and the cope sand, limits the rise i Vof the core to a given and predetermined point, thereby insuring a perfect alinement of thev core, co-axial with the longitudinal axis of the mold, and thus forming a pipe 19 witha uniform thickness inits walls.

It will` Vthus be evident that the core, when placed in thedrag, is permitted to settle, due

to its Weight, in the drag, then due to the lifting effect of the molten metal'as it is poured,

and` flows under the core," the core is lifted, slig tly, into proper alinement in the mold, cite lifting movement is limited by the presence of the pad 14 on the arbor andthe thin" layer 17-of core sand .between the pad andlthecope sand. i Various `a`lterations and changes may be made ini the exemplified structure,`within the scope of my claims, and `it will be understood: that the pad maybe employed on arbors or core-bars of'various sizes', dependingl on the sizes ofthe pipes to be manufactured, as Afoi-instance throughout a range of from three-inch pipe to fifteen-inch'pipe inclusive.

,Havingjthus fully described my invention, what lclaiin as new and desire `to se'- cure Vby Letters Patent is 1.- j

1. An arbor for use infpipe-molds having anrexterior pad at its cope-side and a uniform exterior surface at its drag-side.

2. An arbor for use in pipe-molds having l a semi-circular pad projecting from its copeside and having'its lateral ends merging with the exterior surface of the drag-side of the arbor. l

3.Ar`iv arbor for use in pipe-molds having a semi-circular pad projecting from its cope side, said semi-circular pad having lateral exterior parallel faces, and angular flat faces between said `parallel faces and the semicircular, face at the drag side of the arbor.

In a pipe-casting sand mold, comprising'` a drag anda cope, an intermediate sand coreincluding a centralvarbor, said core being adapted to settlein'the drag, and an exsignature. .f Y Y.

- vTHOMAS G. BUSH, JR. 

